Re: in which month fertile horsetails are found?

I went back and looked at the data for the fern emergence study reported in
HFF Bulletins several years ago. It studied the dates that ferns of various
species emerged in different parts of the USA. The dates for the first
fiddlehead to emerge from plants from 24 different fern species was April 14
to May 17 for a garden in Madison, WI ( latitude: 43 degrees North ).
Emergence from plants of 22 of the same fern species in a garden at New
Gloucester, Maine ( latitude: 44 degrees North ) was April 15 to May 22.
No studies of the Field Horsetails or when fertile fern fronds started to
emerge were made. I donbt know if four or five weeks later for fertile
fronds to appear is reasonable, but it will be interesting to look next
year.

Seems a little late to me, but here in NW Indiana, we had a very mild,
slow spring, and maybe there too? Are you having a good time in Canada?
Seeing lots of ferns?
Betty in South Bend IN
-----Original Message-----

From: Wim de Winter <Wim.deWinter@wur.nl>
Sent: Jul 6, 2008 4:17 PM
To: ferns@hort.net
Subject: [ferns] in which month fertile horsetails are found?
I was surprised to find coning Field Horsetails (E. arvense) as late as
June 22nd in the very South of Canada (latitude: 45 degrees North),
being used to seeing them the first week of April (last of March,
nowadays). Is this the normal time in the US/Canadian border region?
Wim de Winter
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